Software & Apps Windows How to Fix Iertutil.dll Not Found or Missing Errors A troubleshooting guide for Iertutil.dll errors By Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated October 26, 2019 Windows The Ultimate Laptop Buying Guide Tweet Share Email Iertutil.dll errors are caused by situations that lead to the removal or corruption of the iertutil DLL file. In some cases, iertutil.dll errors could indicate a registry problem, a virus or malware issue, or even a hardware failure. There are several different ways that iertutil.dll errors can show up on your computer. Here are some of the more common ways that you might see iertutil.dll errors: Iertutil.dll Not FoundThis application failed to start because iertutil.dll was not found. Re-installing the application may fix this problem.Cannot find [PATH]\iertutil.dllThe file iertutil.dll is missing.Explorer.exe- Unable To Locate Component : This application has failed to start because iertutil.dll was not found.Cannot start [APPLICATION]. A required component is missing: iertutil.dll. Please install [APPLICATION] again. Iertutil.dll error messages might appear while using or installing certain programs, when Windows starts or shuts down, or maybe even during a Windows installation. The context of the iertutil.dll error is an important piece of information that will be helpful while solving the problem. The iertutil.dll error message could apply to any program or system that might utilize the file on any of Microsoft's operating systems including Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, and Windows 2000. How to Fix Iertutil.dll Errors Do not download iertutil.dll from a "DLL download" website. There are many reasons why downloading a DLL file is a bad idea. If you need a copy of iertutil.dll, it's best to obtain it from its original, legitimate source. Start Windows in Safe Mode to complete any of the following steps if you're unable to access Windows normally due to the iertutil.dll error. Restore iertutil.dll from the Recycle Bin. The easiest possible cause of a "missing" iertutil.dll file is that you've mistakenly deleted it. If you suspect that you've accidentally deleted iertutil.dll but you've already emptied the Recycle Bin, you may be able to recover iertutil.dll with a free file recovery program. Recovering a deleted copy of iertutil.dll with a file recovery program is a smart idea only if you're confident you've deleted the file yourself and that it was working properly before you did that. Run a virus/malware scan of your entire system. Some iertutil.dll errors could be related to a virus or other malware infection on your computer that has damaged the DLL file. It's even possible that the iertutil.dll error you're seeing is related to a hostile program that's masquerading as the file. Use System Restore to undo recent system changes. If you suspect that the iertutil.dll error was caused by a change made to an important file or configuration, a System Restore could solve the problem. Copy the iertutil.dll file to C:\Windows\system32\. The idea here is to find a working copy of the file and place it in the \system32\ folder. You can do this a number of ways but the simplest is to search for it in the C:\Windows\system32\dllcache\ folder. It's possible that the iertutil.dll issue is causing Windows Explorer to stop working, which means there isn't a graphical interface to work with—like the desktop, Start menu, taskbar, etc. If so, you can use Task Manager's File > Run new task or File > New Task menu (click/tap the Browse button) to check the \system32\ folder to see if the file is truly missing. If it is, check that the \system32\dllcache\ folder has a copy. If it does, copy it by right-clicking or tapping-and-holding down on the file, and then paste it in \system32\. If you can't find the iertutil.dll file there, you can copy it from a working computer to a flash drive and then copy the DLL file off of the flash drive to the C:\Windows\system32\ folder. Again, if Windows Explorer isn't working, you can use Task Manager to do the copying and pasting. If Windows Explorer is visible and working fine, but the iertutil.dll errors are still happening, you can try to use a free file search tool like Everything to quickly search through all the files on your computer. Then, just copy and paste the DLL file to the appropriate folder as mentioned above. Install any available Windows updates. Many service packs and other patches replace or update some of the hundreds of Microsoft distributed DLL files on your computer. The iertutil.dll file could be included in one of those updates. Repair your installation of Windows. If the individual iertutil.dll file troubleshooting advice above is unsuccessful, performing a startup repair or repair installation should restore all Windows DLL files to their working versions. Test your memory and then test your hard drive. We've left the majority of hardware troubleshooting to the last step, but your computer's memory and hard drive are easy to test and are the most likely components that might cause iertutil.dll errors as they fail. If the hardware fails any of your tests, replace the memory or replace the hard drive as soon as possible. Use a free registry cleaner to repair iertutil.dll related issues in the registry. A free registry cleaner program may be able to help by removing invalid iertutil.dll registry entries that might be causing the DLL error. We rarely recommend the use of registry cleaners. We've included the option here as a "last resort" attempt before the destructive step coming up next. Perform a clean installation of Windows. A clean install of Windows will erase everything from the hard drive and install a fresh copy of Windows. If none of the steps above correct the iertutil.dll error, this should be your next course of action. All the information on your hard drive will be erased during a clean install. Make sure you've made the best attempt possible to fix the iertutil.dll error using a troubleshooting step prior to this one. Troubleshoot for a hardware problem if any iertutil.dll errors persist. After a clean install of Windows, your DLL problem can only be hardware related. Need More Help? If you're not interested in fixing this problem yourself, see How Do I Get My Computer Fixed? for a full list of your support options, plus help with everything along the way like figuring out repair costs, getting your files off, choosing a repair service, and a whole lot more.